sqrt

Calculates the square root.

double sqrt( double x );

Routine Required Header Compatibility
sqrt <math.h> ANSI, Win 95, Win NT

For additional compatibility information, see Compatibility in the Introduction.

Libraries

LIBC.LIB Single thread static library, retail version
LIBCMT.LIB Multithread static library, retail version
MSVCRT.LIB Import library for MSVCRT.DLL, retail version

Return Value

The sqrt function returns the square-root of x. If x is negative, sqrt returns an indefinite (same as a quiet NaN). You can modify error handling with _matherr.

Parameter

x

Nonnegative floating-point value

Example

/* SQRT.C: This program calculates a square root. */

#include <math.h>
#include <stdio.h>
#include <stdlib.h>

void main( void )
{
   double question = 45.35, answer;

   answer = sqrt( question );
   if( question < 0 )
      printf( "Error: sqrt returns %.2f\n, answer" );
   else
      printf( "The square root of %.2f is %.2f\n", question, answer );
}

Output

The square root of 45.35 is 6.73

Floating-Point Support Routines

See Also   exp, log, pow